National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

81°F

27°C

Humidity 77%
Wind Speed SE 6 mph
Barometer 30.04 in (1016.4 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 5 Aug 11:56 pm CDT
Extended Forecast for

Lockhart TX

  • Overnight

    Overnight: Increasing clouds, with a low around 76. South wind 5 to 10 mph.

    Low: 76 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Mostly sunny and hot, with a high near 99. Heat index values as high as 106. South wind around 5 mph.

    High: 99 °F

    Hot

  • Thursday Night

    Thursday Night: Increasing clouds, with a low around 76. South southeast wind 5 to 10 mph.

    Low: 76 °F

    Increasing
    Clouds

  • Friday

    Friday: Mostly sunny, with a high near 97. Heat index values as high as 104. Calm wind becoming south southeast around 5 mph in the morning.

    High: 97 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 75. South southeast wind 5 to 10 mph.

    Low: 75 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 97. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 97 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 75. Southeast wind 5 to 10 mph.

    Low: 75 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 96. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 96 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 75. South wind 5 to 10 mph.

    Low: 75 °F

    Mostly Clear

Detailed Forecast

Overnight
Increasing clouds, with a low around 76. South wind 5 to 10 mph.
Thursday
Mostly sunny and hot, with a high near 99. Heat index values as high as 106. South wind around 5 mph.
Thursday Night
Increasing clouds, with a low around 76. South southeast wind 5 to 10 mph.
Friday
Mostly sunny, with a high near 97. Heat index values as high as 104. Calm wind becoming south southeast around 5 mph in the morning.
Friday Night
Mostly clear, with a low around 75. South southeast wind 5 to 10 mph.
Saturday
Sunny, with a high near 97. Calm wind becoming southeast around 5 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 75. Southeast wind 5 to 10 mph.
Sunday
Mostly sunny, with a high near 96. Calm wind becoming southeast around 5 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 75. South wind 5 to 10 mph.
Monday
Mostly sunny, with a high near 97.
Monday Night
Mostly clear, with a low around 76.
Tuesday
Mostly sunny, with a high near 98.
Tuesday Night
Mostly clear, with a low around 75.
Wednesday
Mostly sunny and hot, with a high near 99.
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ABOUT THIS FORECAST

 
Point Forecast:
Lockhart TX
 29.88°N 97.68°W (Elev. 525 ft)
Last Update:
11:32 pm CDT Aug 5, 2026
Forecast Valid:
12am CDT Aug 6, 2026-6pm CDT Aug 12, 2026
 
Forecast Discussion
 
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Additional Resources

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Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation